AdamP
07-25-2007, 03:59 PM
The motor we are talking about is an S13 redtop... basic modifications: FMIC, intake, 3" turbo back, atmospherically venting BOV
For what I can recall the motor has been ran on mineral oil but since my last change I decide to go synthetic. There were no leaks whatsoever and no smoking. This swap was made ELF Excellium (5W40) at 62,500mi and the oil came out at 65,000mi smelling like gas and it was fairly dark brown.
Car never smokes/consumes any oil and pulls fine.
Today I just went back to regular mineral oil (Castrol GTX 10W40) and a day later the oil after the change (maybe like 50mi on the car) the oil is smelling like gas. Would the smell be caused mainly by the cylinders running rich due to the atmospheric vent? Since the car doesn't smoke I can't see the rings being THAT bad.
Ultimately when I have time on the weekend I am going to do a compression test to see what's up but for now I'd just like a few opinions.
Should I be running synthetic or mineral? Any oils that would prevent blowby better? I was looking at the Royal Purple (Moly additive in there as well) as it looks like it would prevent blow-by pretty well. Maybe the rings/cylinders and somewhat sooted up which would caues this gas seepage into the oil sump.
For what I can recall the motor has been ran on mineral oil but since my last change I decide to go synthetic. There were no leaks whatsoever and no smoking. This swap was made ELF Excellium (5W40) at 62,500mi and the oil came out at 65,000mi smelling like gas and it was fairly dark brown.
Car never smokes/consumes any oil and pulls fine.
Today I just went back to regular mineral oil (Castrol GTX 10W40) and a day later the oil after the change (maybe like 50mi on the car) the oil is smelling like gas. Would the smell be caused mainly by the cylinders running rich due to the atmospheric vent? Since the car doesn't smoke I can't see the rings being THAT bad.
Ultimately when I have time on the weekend I am going to do a compression test to see what's up but for now I'd just like a few opinions.
Should I be running synthetic or mineral? Any oils that would prevent blowby better? I was looking at the Royal Purple (Moly additive in there as well) as it looks like it would prevent blow-by pretty well. Maybe the rings/cylinders and somewhat sooted up which would caues this gas seepage into the oil sump.