Thinking about changing all fluids to synthetic, thoughts?

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06-16-2010, 08:50 AM

#11

69MustangCoupe393cid

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Quote:

Originally Posted by cliffyk

I agree with all of the above--also at 54k miles (you really have a '69 Mustang with 54k on it?) changing all the fluids is just plain ol' good maintenance.

No I wish haha, I'm speaking of my 2000 GT, I guess I should have been more specific.

Quote:

Originally Posted by SVTeeshirt

+1 the f-250 gets that lol.

Have you really or have you just given into commercial advertising? Have you really seen two motors with the same milage with the oil changed at correct intervals? (3k dino 5k synthetic). Yes synthetic lasts longer but you also pay more, for me changing my oil is not much hassle at all. If a car is maintained dino oil is doing the job just as well as synthetic. We've had a few vehichles break the 300k mark burning little to no oil, its all about maintance. Hell theres still a 91 ford ranger running around with 375k that we once owned.

Yes I really have, now the one engine was neglected and used cheap oil, the other was used in auto cross and race events at times, and was running synthetic with oil changed every 3k miles, give or take abuse on that specific change. Granted the change interval probably has more to do with engine wear then synthetic oil, but there is a lot synthetic has to offer that organic oil does not.

Quote:

Originally Posted by cliffyk

Yup, but...

I'm not even inclined to allow that it lasts longer; as there's nothing about it that reduces combustion by-products (water vapour, acids, carbon, etc.), or that extends the additive life. 20% of motor oil is additives, the same additives regardless of the base stock (dino or synthetic).

This said, I have been running 10W-40 Pennzoil (or "Q", same thing) synthetic in my '03 GT for 70k miles, mostly because it's reasonably priced at Wally-World--but also changed every 3000 miles for the reasons stated above.

At the first sign of consumption it will go over to 10W-40 Valvoline MaxLife; I have run 4 or 5 cars to over 300k miles on that stuff...

Amsoil has more (I forget the name), but it absorbes more of the fuel and combustion by-products then regualr engine oil, therefore "lasting" longer. However I don't condone running synthetic and not changing it for 10k miles. I do synthetic changes every 4-5k miles. My buddy does his once or twice a year however, and puts tons of miles on his engines (30k plus a year some years) and they look amazing inside. He is part of the reason I stand by Amsoil products so much, I do think he's crazy for not changing more often though.