Engine oil RED LINE or OEM Volkswagen

4 qts Redline 5w40, 1 qt Redline w40 Race Redline blows away the competition... Lumps of ZDDP and Moly with the Race oil mix, fuel dilution pretty much disappeared, and viscosity/flashpoint are well within reason.

I would stick with a tested oil like Red Line 5w-40 or GC, but that's me.

Sticking with a single weight is a better idea than mixology IMO..

Given that it's almost guaranteed that this was not a turbo engine originally (the lack of factory air filter is another clue) she'll run hotter than usual and so a quality oil is a good investment.

I have been running redline 5W40 since 5k miles in my 08 GTI and I noticed an immediate improvement in turbo spool up. Others have noticed this improvement on other turbo cars as well.

i run 0w30 in my jetta 2.0. fully synth. have for 33,000 miles, no problems, other then better gas mileage

I am planning on using redline 5W40 which is not on the vw approved list but has an awesome HTHS viscosity and I have used it in my boxster S with big improvements over M10w40.

Personally I use 8-10k change intervals on my Jetta, its rated for that, and i use the right oil.

I've been running Redline or Royal Purple 40wt

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.