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Old 07-15-2003, 11:28 PM
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Mobil 1 in 1969 corvette

Hi guys.---I was at a local car show today and the talk was about the use of a SYNTHETIC oils and ATF fluid in older cars.--When i bought my 1969 corvette last year i put Mobil 1 Synthetic Supersyn and Mobil ATF synthetic in my car.---The talk at the car show today was that the new Synthetic oils would leak-out the seals in older clasic cars.---So when i got home i went to Mobil 1 web page and they have this info listed under one of their MYTHS.---According to Mobil their synthetic oils can be used in all older cars.---Any info would be helpfull.---Thanks to all.

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Old 07-16-2003, 07:19 AM
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Well, it is a myth and then again it isn't.

Synthetic oils have smaller molecules, which can find their way through cracks in gaskets that fossil oils can't. That’s where the leaks come from. If your seals and gaskets are in good condition then you most likely won't have a leak problem. It surfaces most often when a poorly maintained or very high mileage car is switched over.

Synthetic is the way to go, by the way. No fossil oil will lubricate as well as a good synthetic.


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Old 07-16-2003, 10:32 AM
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Thanks Centerline.---Good info.---Some of the guys at the show were saying that the new synthetic oils would cause damage to the rubber seals of older classic cars which would cause the seals to become soft and contaminate the fuilds.---Thanks Again..
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Old 07-16-2003, 08:53 PM
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Originally posted by lori-due
Thanks Centerline.---Good info.---Some of the guys at the show were saying that the new synthetic oils would cause damage to the rubber seals of older classic cars which would cause the seals to become soft and contaminate the fuilds.---Thanks Again..
Absolute hogwash, don't listen to a word of it. Synthetic oil is the best thing since whipped margarine.

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Old 07-16-2003, 09:47 PM
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I'm kinda thinking that what those guys said might have merit. I mean the reason the old R-12 systems weren't compatible with R-134a wasn't because of the refrigerent, it was because the synthetic oil used with 134a. The oil would attack the seals, which were nitrile rubber the same thing the seals in the crankcase were made of then. I never felt the need to run synthetic oil in anything, so I couldn't say one way or the other about it causing leaks in an older motor.
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Old 07-17-2003, 10:02 AM
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Although both oils are synthetic their formulas are quite different. Each has its own purpose and a specific formula with unique additives which allow the oil to function under its designed conditions.

What I'm basically saying is that comparing synthetic motor oil to the P.A.G (Polyalkalineglycol) oil used in R134A air conditioning systems is like comparing apples and oranges.

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Old 07-17-2003, 06:08 PM
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After an engine is broken in a synthetic is fine. I do know from experience though that with older seals that they will leak more, if they don't have a little weep they probably won't. I had a 5.0 GT that had about a 100,000 on it and it had a small rear seal leak and I noticed that it was worse when I was running the synthetic, slippery stuff.
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Old 07-17-2003, 09:07 PM
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Makes sense to me about leaks being worse with synthetic oil, but it not actually hurting the seals. I was just wondering if that comparison I made might be a possibility as to why someone would think that.
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Old 07-17-2003, 09:38 PM
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As soon as my 302 was broken in I switched to Mobil1 10W30 synthetic. I still change it every 3,000 miles and I swear she's just as clean on the dipstick with 3,000 miles as when new.

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Old 07-18-2003, 06:19 AM
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Originally posted by dmorris1200
As soon as my 302 was broken in I switched to Mobil1 10W30 synthetic. I still change it every 3,000 miles and I swear she's just as clean on the dipstick with 3,000 miles as when new.

Your wasting money changing synthetic every 3000 miles. With a high efficency filter like the Mobil 1 filter you can safely go 7000 miles between changes. I had been running Mobil 1 in my wifes Tahoe for a number of years with a regular Fram filter. I happened to stumble on an oil filter test on the net one evening that really opened my eyes about Fram filters. Basically the article said if your running synthetic and not using a high efficency filter your wasting your money. I quit using the cheap Fram filters and now use either the Mobil 1 filter or AC PF35L high efficency filter. I have noticed that the oil stays cleaner for a much longer period of time. The old wives tail about if your oil is staying clean it isn't doing it's job, is just that, and old wives tale. If your oil is getting dirty your filter is not doing the job it is supposed to.

Additionally, if your engine is leaking oil before you switch to synthetic you will have a worse leak, but synthetic will not damage older seals and cause leaks.

Vince
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Old 07-18-2003, 12:15 PM
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If you want to see really clean oil, switch to propane. I used to service a local propane dealers' vehicles and the oil looked like it came from the can (tells you how long ago it was) after 10,000 miles.

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Old 07-19-2003, 09:36 AM
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Hey Vince your exactly right about wasting my money at 3,000 mile changes, but I don't mind. I buy it at Wal-Mart so it's not that bad and some things I don't mind throwing a little extra money into. You're right about the filter. I still use a standard oil filter which has been the main reason why I still change her every 3,000 miles. Is the Mobil1 filter really that much better? I may try it although I will still probably change it too soon anyway. I don't drive her all that much (summers only here in Maine) so it really doesn't add up to all that much in oil changes per year. I wonder if Wal-Mart sells the Mobil1 filters too. Where do you get yours?

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Old 07-19-2003, 09:42 AM
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Have any of you lost oil pressure after you switched to synthetic? Just wondering, I know that i lost about 10 psi at idle after the engine got to 160º.
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Old 07-19-2003, 09:42 PM
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$15layn---I did not lose any oil pressure using MOBIL 1---i AM USING mOBIL 1 (15w50) IN MY 1969 VETTE.---Vettes always seem to run a little hot.--It is that dam angle the radiator is sitting in.----15w50 will protect the engine better than 10w30.---Thanks alot guys for all the posts.....
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Old 07-20-2003, 02:25 AM
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Several years ago, a friend of mine talked to the Mobil engineers who developed Mobil-1. They said they used it in their own personal cars. They said they changed filters every 3000 miles & just topped up the oil level, and did a complete change every 24,000. He used it in his 85 Tercel from ~50,000 on (previously Castrol GTX), & the little beast has almost 200,000 miles of hard use on it & it still doesn't burn oil. It does pretty much pour out the front seal lately, but how many of those get to 200K anyway?
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