Engine oil - Fiberglass RV


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Old 05-08-2013, 07:52 PM   #1
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Engine oil

If you've switched from regular engine oil to synthetic have you noticed any improvement in performance or extended engine life? Trying to decide if I want to make the switch. Any comments will be appreciated. Thanks
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Old 05-08-2013, 08:02 PM   #2
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I think any anectodal evidence about longevity would be of little value, considering how long engines last nowadays. As for performance, I have noticed no difference.

I am of the opinion, based upon reading, that engineered-from-scratch full synthetics will resist long chain molecule breakdown far better than refined petroleum oil. In other words, dino oil will thin out faster. But it seems that this breakdown is not significant for the first 4,000 or 5,000 miles anyway. So if one changes the oil faithfully at intervals of 5000 or less, it probably doesn't make much difference.

I have run some Mobil 1 and Amsoil for extended intervals up to 15,000 miles, mainly in my Mercury. 180K miles, engine still doesn't use more oil than when new. My Toyota oil filter size and type isn't conducive to long intervals, though.
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Old 05-08-2013, 08:31 PM   #3
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I stay with one brand of regular oil and do frequent oil changes, between 2000 and 3000 miles. One of my tractors I bought new in 1968, changed oil more often than recommended, and it uses no oil yet. I've always understood that if you are going to use synthetic oil you should do so from day one when the vehicle was new. When I worked for a nationwide truck leasing company we used regular engine oil but synthetic gear oil. If you haven't been using synthetic, I wouldn't switch now.
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Old 05-09-2013, 10:19 AM   #4
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If you wait to long and the engine is already worn then the synthetic aint gonna help. The + side of the synthetic is that all molecules are the same size so it helps to maintain the same protection around the parts to keep them from having metal to metal contact

On high mileage engines try Restore. It has been around for a long time and magazines that test stuff like this state it works.
Restore USA - Engine Restorer
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Old 05-09-2013, 10:37 AM   #5
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oil filter

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Originally Posted by Mike Magee View Post
I think any anectodal evidence about longevity would be of little value, considering how long engines last nowadays. As for performance, I have noticed no difference.

I am of the opinion, based upon reading, that engineered-from-scratch full synthetics will resist long chain molecule breakdown far better than refined petroleum oil. In other words, dino oil will thin out faster. But it seems that this breakdown is not significant for the first 4,000 or 5,000 miles anyway. So if one changes the oil faithfully at intervals of 5000 or less, it probably doesn't make much difference.

I have run some Mobil 1 and Amsoil for extended intervals up to 15,000 miles, mainly in my Mercury. 180K miles, engine still doesn't use more oil than when new. My Toyota oil filter size and type isn't conducive to long intervals, though.
Mike :When you run synthetic oil for a 15000 mile OCI do you change the oil filter at 7500 miles ?. From what I have read the oil will last for 15000 miles but the oil filters are not designed for 15000 miles and end up going into bypass long before you change oil . NAPA told me that their NAPA Gold filter (Wix ) is not rated for 15000 miles . This may be a good question for Floyd
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Old 05-09-2013, 10:54 AM   #6
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I have run Mobil-1 exclusively in my 2003 GMC Sonoma and, at 158,000 miles do not use a drop of oil nor do I have any leaks. I started with synthetic simply because I would always forget to get an oil change every 3-5k miles. I usually run to about 7.5 - 8k miles between changes and have been satisfied with the extra expense.

But don't expect to get any better performance, economy or more admiring stares just because you use synthetic oil.
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Old 05-09-2013, 10:56 AM   #7
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Manufacturers oil change intervales seem to be getting longer and oil filters do seem smaller. Our Subaru has the latest version of their boxer engine. It uses 0W20 synthetic changed every 7500 miles. Also the oil plug uses a crush washer and the oil filter is right under the hood, both *nice features. Raz
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Old 05-09-2013, 11:20 AM   #8
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I have an oil filter that is clearly labeled "30,000KM or 2 years" The manufacture of the car also recommends 10k miles (that's the filter for said car). The oil change analysis indicates 15k miles is correct change interval for my car.

The old recommendation for not switching to synthetics was the molecule chains have an easier time leaking out and clean out the crude left behind (and sealing to some extent) by the dino based oils. So on a really high mileage car with worn seals the gunk left behind by the dino oil is keeping it from leaking. Switch to synthetic oil and there is high probability of the gunk getting washed out and oil leaking from the newly exposed seal defects.

My car is tough on oil. Mobile One won't cut it. MB 229.1(?) spec oil or VW 505.01 spec oil will put up with a lot and last a long time. Costs more so you have to leave it in a long time to make the ROI work out.

Jason
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Old 05-09-2013, 11:46 AM   #9
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Reliable, independent evidence that "synthetic oil" is measurably better for an engine in the long run is very hard to find. And it's definitely harder on the pocketbook!

Francesca
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Old 05-09-2013, 11:56 AM   #10
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Originally Posted by Francesca Knowles View Post
Reliable, independent evidence that "synthetic oil" is measurably better for an engine in the long run is very hard to find. And it's definitely harder on the pocketbook!

Francesca
I have purchased Quaker State, Mobil 1 , Penzoil Platinum, and Napa , full synthetic oil for as low as $2.29/ Quart . Not much difference in cost than Dino or synthetic blend oil ( I realize these are not considerd "Full Synthetics by the Amzoil crowd)
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Old 05-09-2013, 12:30 PM   #11
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I became a believer in the early 1960's when STP was used by a friend of my older brother (he managed a dairy truck fleet). He set up half his fleet of refrigerator trucks with, and half without STP. The normal need for scheduled teardown/rebuild doubled. I then was turned onto Amsoil for my brand new 1979 Diesel Rabbit manual transmission, which was impossible to shift in below zero Michigan weather until after an idling engine would warm it up. The Amsoil synthetic allowed immediate cold shifting. I've been using synthetics throughout (diff/trans/transfer case/power steering) and have noticed great improvements in all, especially in extreme high or low temps (I now live in Arizona). I always keep vehicles well over 100,000 miles.
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Old 05-09-2013, 12:30 PM   #12
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Tough on Oil???

What is the vehicle that it "Tough on Oil" and why? I think that I may want to avoid that one.....


Quote:
Originally Posted by SilverGhost View Post
I have an oil filter that is clearly labeled "30,000KM or 2 years" The manufacture of the car also recommends 10k miles (that's the filter for said car). The oil change analysis indicates 15k miles is correct change interval for my car.

The old recommendation for not switching to synthetics was the molecule chains have an easier time leaking out and clean out the crude left behind (and sealing to some extent) by the dino based oils. So on a really high mileage car with worn seals the gunk left behind by the dino oil is keeping it from leaking. Switch to synthetic oil and there is high probability of the gunk getting washed out and oil leaking from the newly exposed seal defects.

My car is tough on oil. Mobile One won't cut it. MB 229.1(?) spec oil or VW 505.01 spec oil will put up with a lot and last a long time. Costs more so you have to leave it in a long time to make the ROI work out.

Jason
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Old 05-09-2013, 01:42 PM   #13
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The cam driven injectors necessitated a change in cam lobe size to make room. A combination of that and less than ideal oil flow to the bearings, lifters, and lobes can lead to cam lobes wearing through the top of the lifters. There was also a rumor that there was some issues with metallurgy in the cam that contributed to premature cam wear.

The solution, from the very start, was a high film strength oil that would keep the cams adequately lubricated. This applies to Pump Duese version of the TDI that Volkswagen makes.

Then there was/is the 1.8T in the A4 Audi and Passat VW. That engine would still sludge up on Mobil One, but not VW spec oil.

Neither engine is made anymore. And both have shown the ability to go over 300k miles if taken care of. I like mine and just figure pricy oil change is cost of admission.

Jason
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Old 05-09-2013, 03:20 PM   #14
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Quote:
Originally Posted by steve dunham View Post
Mike :When you run synthetic oil for a 15000 mile OCI do you change the oil filter at 7500 miles ?. From what I have read the oil will last for 15000 miles but the oil filters are not designed for 15000 miles and end up going into bypass long before you change oil . NAPA told me that their NAPA Gold filter (Wix ) is not rated for 15000 miles . This may be a good question for Floyd
I have been asked this question many times...
My response is another question...
"What sort of underwear do you wear?"
The response is usually..."!!????!!
The question appears to be a non sequitur until I explain...
"Boxers, breifs, silk, or cotton, They all get soiled and must be changed frequently.
Use a good quality motor oil which meets the required SAE spec for the application and change it often. I change my oil at 3000miles and my underwear daily. Some folks are comfortable with going twice as far...
Beyond that, there starts to be consequences.


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