Redline MTL is the only lube I could notice a diff and it plain shifts better.
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.
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 was having trouble a while back with a grind in third gear when I was WOT and shifting fast from 2nd to 3rd. I recently put my car back on the road and put in Red Line Heavy Shock Proof Gear Oil. I have shifted a half a dozen times fast into 3rd and I have not got a grind yet . I like this stuff so far.
Mobil 1 0w-40 is approved by VW, Porsche, MB. If you don't mind the price, Redline 5w-40 is excellent for our 1.8T engines. From the oil analyses I've seen, Redline has shown a few \"Parts Per Million\" less in metal wear than Mobil 1 5w-30 or 0w-40. Redline has more Moly than most oils. But for me, a few PPM is insignificant over 7k-8k miles. I still use Mobil 1 though cause it's cheaper (Costco) and can be found anywhere.
I use redline MT90.. it works great (But please read below.. there's more to this). Eliminates the notchyness and allows for quicker shifting at higher RPM.
I love it, I noticed the difference right away. All the notchiness was gone or at least a lot less noticable after putting the mt90 in.
I know its a great product but only difference I noticed is less notchy when cold.
Never tried Royal Purple but have used Redline a few times before and will continue to use it. Great stuff!
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