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Unread 11-16-2007   #1 (permalink)
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Default 1994 Mustang GT - synthetic oil vs regular?

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The most basic of questions ...WHY is synthetic oil better than standard oil? Is it simply because synthetic is made in a lab, and contains none of the contaminants found in the refinded crude that ends up in a bottle?

Second question - assuming that synthetic is "better", which brand do you prefer, and why?

Third - what are your thoughts on Royal Purple? Is it REALLY as good as it appears to be? Has anyone had anything close to the MPG and/or HP gains that their website proclaims?

Thanks, in advance

Scott
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Unread 11-16-2007   #2 (permalink)
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Synthetic oil is more resistant to breakdown and will withstand higher temperatures than mineral oil, therefore you can extend the oil change intervals to about double what you'd normally use for mineral oil (e.g. 6000 miles v 3000 miles).
Since synthetic oil is more slippery than mineral, less horsepower is lost to internal engine friction and more is transmitted to the rear wheels. The rwhp gain is typically about 2-3% if you add synthetic to the engine, transmission, and differential.
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Unread 11-16-2007   #3 (permalink)
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I have heard that it is not a good idea to switch to synthetic unless you have a relatively new engine. Is this true at all? If it is true what would be the reason.
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Unread 11-16-2007   #4 (permalink)
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The only reason for not switching to synthetic oil in a high mileage engine is that if the rubber seals (especially the rear main) are old and only leak-free because there's encrusted oil/varnish on them, the synthetic could strip those deposits off and cause those seals to leak. Otherwise there's no problem using synthetic oil even on a 100,000+ mile engine.
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Unread 11-19-2007   #5 (permalink)
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i have a 95 gt that i just picked up with 112k on it and i just changed the oil and am running synthetic and i have no leaks, or complaints at all just my two cents
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Unread 11-19-2007   #6 (permalink)
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I've used Royal Purple and it's great. Any quality synthetic is light years better than mineral oil, in every way possible and it's worth the extra money.
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Unread 11-20-2007   #7 (permalink)
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Quote:
Originally Posted by EagleAutosports View Post
I've used Royal Purple and it's great. Any quality synthetic is light years better than mineral oil, in every way possible and it's worth the extra money.
Eagle-
Does your comment mean that you still use RP, or have you found just as good results with regular synthetics? I'm really interestd in RP for the MPG and *possible* HP boost, but extended engine life and part wear are my primary concerns. In other words, if I can get similar results with a brand name synthetic (for 1/4 of the price of RP), then I'll probably go that route - maybe treat my baby to 2-3 changes a year with the good stuff, then regular synthetic for all the other changes. At $7-8 a quart, that can get costly if I were to use RP all the time, but then again, I could extend the duration between changes, too, so maybe the cost (over time) wouldn't be all that bad.
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1994 Mustang GT
5-speed 302 | Tremek T3550 tranny | 4.10 gears | King Cobra clutch | U/D pulleys | Long tubes | 65mm throttle body | fender-mount forced air intake | liquid-filled FPR | Autometer Lunar series gauges | weld-on subframe connectors | adjustable caster/camber plates | aluminum driveshaft | Fluidyne aluminum radiator & more...
...and crappy factory wheels
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