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i have a 2000 firebird with almost 1 hundered tousand miles on it. i am switching from regular 5w30 to synthetic. how thick should i get it.
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Re: how thick
I think that's backwards - 5-30 if cold; 10-30 if hot. GM recommends 10-30.95Camaro3.4T5Conv Red/White*SLP Bilsteins*BMR Tower Brace*CAI*NiehoffIgn*NGK PlatPlugs*DelcoHiPerfWires*FlowmasterCatback*RedDe vilReso(no cat)* DynoMax Muffler*B & M Shifter*Eurolite Lamps*Yokohama Avid 235/55/16*GM 3.73s*Auburn LSD*Sirius*All DONE! -
Re: how thick
I've heard that synthetic will damage your seals if you have more that 75,000 miles. Sometime ago I started using synthetic. After that the rear seal and gasket started dripping. Others say that is OK using synthetic if you add some extra-additive to protect your seals. Yesterday I changed the oil and I used High Mileage Castrol GTX (contains additives to protect seals) because I was not sure about synthetic. My desicion of not using synthetic for now came from the amount of money I spent for the dealer to change the rear seal and gaskets.Camaro99\'3.8, original spoil package (no body mods...PROUDLY), K&N, Lid 3800II, SLP CAI, Flowmaster, Z28Chrome Tips, 180* Thermostat.Comment
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Re: how thick
do NOT switch to syntheticComment
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Re: how thick
synth won't damage seals, it just seeps through leaks that regular, thicker oil, caint.1978 Formula 461 in progress of being built :rock:
2013 Ram 1500 Big Horn
former owner of 85 bird w/ 2.8 - 3.4 - 3800 II - 5.0
94 comero 3.4Comment
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Re: how thick
Hmmmm, I always thought the thicker oil was for colder weather.K&N CAI, Magnaflow High Flow Cat, Flowmaster American Thunder 2.5\" Cat-back exhaust w/ 40 series Muffler (single piped exit), Pacesetter Midlength Headers, TB Bypass.<br /><br />Vid of my 3.4 - <a href=\"http://media.putfile.com/Headers49\" target=\"_blank\">http://media.putfile.com/Headers49</a>Comment
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Re: how thick
Originally posted by fast 3.4
no, it is the oppositeComment
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Re: how thick
How good is to use those additives sold separate that protect seals?Camaro99\'3.8, original spoil package (no body mods...PROUDLY), K&N, Lid 3800II, SLP CAI, Flowmaster, Z28Chrome Tips, 180* Thermostat.Comment
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Re: how thick
10w-30 is what I would use most of the time. Maybe 0-30 or 5-30 in winter.
I wouldn't bother switching to syn if your engine already leaks.
Keep away from 99% of the additives, especially if there isn't something wrong with the motor now!\'00 f-bird 3.8 M5 coupe, pewter metallic<br />Torsen LSD, Pro 5.0 shifter, Spec stage 1 clutch, Y87 muffler, aftermarket stereo<br />-more fun than the Oldsmobile it replaced...Comment
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