Thread: German Castrol Syntec 0W30

Quote: Originally Posted by bulwnkl Yeah, but I couldn't help razzin' you. For the sake of anyone reading this thread, I run analysis regularly (the expensive but extremely useful kind from Dyson Analysis) and usually have a fairly decent idea what's going to happen before I put a fluid in. I did decide to run Red Line's 5W20 once in a non-Subaru vehicle that spec'd 5W30. Dyson felt certain that it'd run well on...

Yeah, but I couldn't help razzin' you. For the sake of anyone reading this thread, I run analysis regularly (the expensive but extremely useful kind from Dyson Analysis) and usually have a fairly decent idea what's going to happen before I put a fluid in. I did decide to run Red Line's 5W20 once in a non-Subaru vehicle that spec'd 5W30. Dyson felt certain that it'd run well on it. Really beat on that vehicle hard...

There are lots of threads on GC that cover this. The concensus seems to be that it resists shear better than most 5Ws. I run it all year long, and many others do too. Do some searching and you'll find all the info you need (and then some).

Where do you live? If it gets below zero in the winter, the 0w will be good for cold cranking. If you are in a moderate climate, the 0w likely means nothing, but the highlight of GC is below. Anyway, the 100 degC viscosity (12.1 cSt) is actually in the low 40 wt range so it will likely shear into a mid 30 wt over a 4k oil change so it's a perfect candidate for our engine (as opposed to a mid 30 wt that shears into a 20 wt in 1000...

Quote: Originally Posted by bulwnkl I did decide to run Red Line's 5W20 once in a non-Subaru vehicle that spec'd 5W30. Dyson felt certain that it'd run well on it. Really beat on that vehicle hard for that run. You could see that I had my foot on the floor towing quite a bit from the UOA, but you could also see lower wear than many people get just driving around. Fluid selection is very important if you're not just driving...

I run it all year long without any problem. No significant loss of oil like some people experience with mobil1

Quote: Originally Posted by stiskeet I have an 06 STI and was wondering if it's ok to run German Castrol even though it's 0w30, not 5w30 and it's summer time. Thanks in advance. Yes, you can run it all year long. GC is also more stable than most 5w30's. IMO, its better than every mainstream 5w30 out there except Amsoil.

Quote: Originally Posted by txl146 I run it all year long without any problem. No significant loss of oil like some people experience with mobil1 same here. to the t.

Quote: Originally Posted by RonJitsu GC is also more stable than most 5w30's. IMO, its better than every mainstream 5w30 out there except Amsoil. Hell, given its top notch UOA's that show up everywhere (all over BITOG for example), German Castrol 0w30 is probably THE best oil widely avail in stores. (autozone for instance) Excellent for WRX/STi's. And yes, my STi still burns a bit of oil, but less than using Mobil1. In fact, i...

Quote: Originally Posted by Uncle Scotty :banging head: Elaborate if you have some quick data. I'm thinking about switching from Rotella to GC. After 9000 miles I've heard my car is starting to stink. Stock cats, zero consumption.