On the 16v I had I also had a cyl head temp gauge and temps dropped from 240F to about 210F when I switched from Mobil 1 to AMS, so did my oil temp drop fromt eh 250 to 215 range.
Using Redline racing 50W in a SCCA 1.6L production engine with an oil temp of about 210 to 215 degree (F) on a hot southeastern race weekend. Hot oil pressure is about 70 to 75 psi at WOT and about 30 psi after a session in the paddock prior to shut down.
For the past 5 seasons, I've been running 5w-30 Mobil 1 but recently switched to Red Line 30 Wt with no ill effects. Typical oil temps (racing on in the Mid-Atlantic area with temperatures and humidity in the 90s) are 250ish with 30-45 PSI hot oil pressure at full chat.
i use mobil delvac 1 5w40 synthetic oil in my 2000 beetle tdi.
did my first oil change 2 weeks ago, put Mobil1 0w-40 in... and I'm getting better gas mileage than I was on the factory oil
I used to run Mobil 1 5w30 and switched to GC. There was a nice difference, with only one side effect - the engine feels super sluggish when cold compared the Mobil 1. It runs great once warmed up though!
I've used Mobil1 (0w-40, 5w-30), Shell RotellaT (5w-40) and Castrol Syntec (5w-30) past 100k miles. Before 100k, it had whatever garbage the dealer put in. Engine still runs like a top with great fuel economy and no unusual oil consumption at 203k miles.
I'll continue to use my Mobil 1 0w-40 for another 4 years.
Mobil 1 does make 5W-40. I use it. They label it Truck and SUV but don't let that throw you-just a marketing ploy. I switched from 0W-40 and my oil temps are slightly lower. My car is not winter driven so I don't need anywhere near a 0w. If I remember correctly 5w-40 is thinner than 0w-40 above freezing anyway.
same here in IL - 132K still going strong
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