Topic: Royal Purple Oil
in Forum: C3 Engines
I recently saw a dyno test on tv where they ran regular straight 10W40 motor oil vs Royal Purple 10W40 Synthetic Oil. They had a net gain in HP of about 11. Now if I hadn't seen it, I would question the veracity of the claim.
1. Anyone have any thoughts on Royal Purple Synthetic Oil?
2. At what point should I make the switch from real oil to synthetic? I have about 3000 Miles on the new engine.
3. Any thoughts on the HP gain?
Jim
Lifetime Member #73
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Depends on how tight your engine is. When I went with Castrol Syntec, I had leaky type problems that may be associated with the molecules being smaller and slicker. I took an old 350 block and heads and had them reworked. If you have a new crate engine, it shouldn't be a problem.
I didn't notice any reduction in hp with the non-synthetic oil.

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I know a lot of guys that swear by RP erls/products. I've never used them myself, tho.
Joel Adams
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1. Anyone have any thoughts on Royal Purple Synthetic Oil?
2. At what point should I make the switch from real oil to synthetic? I have about 3000 Miles on the new engine.
3. Any thoughts on the HP gain? Jim[/QUOTE]

Jimmy B.
Just can't wait to get on the road again.
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Lifetime Member #73
The Money Pit.... and my niece
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Lifetime Member #116
Dave's '82

Be sure and post your time slip. I'm gonna guess 13.5 @ 105mph. With a good RT you might do better.
As for the royal purple oil, IMO at $5 per quart ,it's a waste of $$. I tried it but went back to Valvoline



Jimmy B.
Just can't wait to get on the road again.
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Not worth getting a ticket here in Virginia since a resident can now be given the death penalty for speeding here...(okay I may be exaggerating a bit but not much).
Lifetime Member #73
The Money Pit.... and my niece
(click to see a slightly larger version)