Hey guys I've been running Havoline 20w50 in my 69 Firebird with a .040 Pontiac 400. I just put some Royal Purple 20w50 and now it smokes on start up after it has sat over night. I noticed this also when I ran RP15w40. It does not smoke with the Havoline or other conventional oils I have tried. What gives.
Start up smoke on Firebird
- Thread starter James408
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Try some Auto-Rx.
Your valve seals need to be treated or R&R.They are brittle,Auto-Rx will treat them and make them soft so they can seal again.Will also treat all the other seals.
Good Luck...
Your valve seals need to be treated or R&R.They are brittle,Auto-Rx will treat them and make them soft so they can seal again.Will also treat all the other seals.
Good Luck...
Thanks guys for your input. My 400 was rebuilt 5 years ago and has less than 5000 miles on it. Now, I do know that my machinest gave an extra .005 clearance on the bores. This car is not driven everyday or weekend either. It is driven once or twice a month if this makes any difference.
I'd just buy the Havoline 20W-50, it's much cheaper than either Royal Purple or Auto-RX...
I think synthetic may be a bit too much for a "muscle car" engine designed in 1969. Just my $.02...
I think synthetic may be a bit too much for a "muscle car" engine designed in 1969. Just my $.02...
You need to Auto-Rx the engine. By on-line from www.auto-rx.com
The Royle Purple ruined your valve seals. I recommend that you thoughly remove the RP and replace it with an oil that has seal condioners like Valvoline Maxlife.
James408,
Are you sure your machinist gave you .005 and not .0005? An extra .005 is way too much clearence for a piston to bore fit.
Are you sure your machinist gave you .005 and not .0005? An extra .005 is way too much clearence for a piston to bore fit.
Originally posted by BlazerLT:
"Whoa, hold on there, are you saying Royal Purple ruined his seals? Are you seriously trying to say that?"
Whenever I post without a smiley, that usually means I'm serious yes.
"Whoa, hold on there, are you saying Royal Purple ruined his seals? Are you seriously trying to say that?"
Whenever I post without a smiley, that usually means I'm serious yes.
BlazerLT,
This has happened many times before by someone switching from DINO to synthetic on this board. RP and Mobil 1 have done this to more than a few BITOG members.
When the balance between Ester and PAO is not just right for a given seal, causing the seal either to expand or shrink, seal failure is prevalent.
This has happened many times before by someone switching from DINO to synthetic on this board. RP and Mobil 1 have done this to more than a few BITOG members.
When the balance between Ester and PAO is not just right for a given seal, causing the seal either to expand or shrink, seal failure is prevalent.
Ok, first off, I don't think RP has detroyed my seals because it was only in my car for one day.
As far as the extra clearance, my machinest, who is a friend of mine told me 5 thousands. The extra clearance is recommended for my forged pistons. When a forged piston heats up, it expands.
To play it safe, I believe I'm going to go back to the Havoline 20w50 SL.
Anybody have a paint strainer and need some slightly used Royal Purple. I'll make you a good deal. (ha, ha)
As far as the extra clearance, my machinest, who is a friend of mine told me 5 thousands. The extra clearance is recommended for my forged pistons. When a forged piston heats up, it expands.
To play it safe, I believe I'm going to go back to the Havoline 20w50 SL.
Anybody have a paint strainer and need some slightly used Royal Purple. I'll make you a good deal. (ha, ha)
I agree-since it was only 1 day there is no chance that Royal Purple "destroyed" your seals.
How much smoke are we talking about? Is it just a quick puff? Or does it smoke for several minutes after startup?
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