cthomas

I have a '98 Z28 with 92,000 miles on it, most of those miles were on it before I bought it a year ago. I have only driven it about 2500 miles in the past year that I have owned it and have been changing the oil with regular Castrol GTX 5W30. Everything I have read talks about synthetic being such a better a product and lasts longer. However with this many miles on the car and not knowing what has been used it previously, i'm not sure if I should change to synthetic or not. There are'nt ANY oil leaks on the car now and I have read that synthetic oil will "find" any bad gaskets and can start leaking. What to you guys think? Change to synthetic or stay with dino oil?

MrDude_1

iTrader: (4)

put syn in....

digitalsolo

iTrader: (24)

I second the Synthetic. No reason the car should start leaking from synthetic oil. I swapped to syn in my GTP at 66K, no issues, at 124K now, still no issues.

snake charmer

iTrader: (118)

i used dino juice in my ta until it hit 50k. when i changed to synthetic i noticed the valvetrain was a little more quiet. i have had no problems out of synthetic.

Tranzor

Like the others have said, you should have no problems switching to synthetic... the only thing you'll have to get used to is extended drain intervals.

TAQuickness

iTrader: (28)

hmm... I bought my TA with 47k on the clock. At 47,050 I switched to synthetic. Started leaking everywhere. However, I don't think the synthetic was at fault. A later teardown proved the previous owners didn't take care of the car.

Had the motor rebuilt. First 100 miles were on dino. Been running synthetic ever since.

cthomas

Ok sounds good, I have seen alot of info on different grades too. Should I stick with 5W30 in synthetic or 10W30 or what? And what is the deal with German Castrol? How do you know which is which?

INTENESS

iTrader: (4)

I vote for the castrol Syn 0-30 lot of good feedback on that.Do a search should help you out

Y2K SS

iTrader: (1)

German Castrol is good but if your gonna stick with or run Mobil 1 then go to the 0-40w because the 10-30 runs on the thin side.

cthomas

I was looking at AutoZone yesterday for the German Castrol and seen a couple of different bottels. On most of them on the back it would say "Made in USA from domestic and imported products" and Not for sale out of the America's" I seen another grade (not 0W30) that clearly said on the back "Made in Berlin" and did'nt say anything about not being for sale outside the America's, so I figured this should be right, but wrong grade. So I asked the guy working there when they would be getting some more 0W30 Castrol Syntec in? He said "I think there is some in the back", so he brings it out. This looks different than the other bottels too. On the back of it, it said "Made in Germany" but I beleive it also said "Not for sale outside the America's" or something like that. I might go back and buy it this week, but this is just confusing. Why does'nt Castrol just use German only or mark it clearly or something.