Redline is great, used it for years in a track car.
My STI also used it for a while (0w40), but then switched to Rotella.
Redline user have been since I picked up my 04 WRX wagon two years ago. Auto crossed and rally crossed. Works great have had zero issues, also at 170,000 miles on the original engine and still running strong.
I use Redline, similar quality and price to Amsoil, without the MLM BS.
One of the best engine oils, exclusive Zic lang ginagamit ko, and it's a Korean company so alam mong goods yan. Pero ako Zic X9 ang ginagamit ko, mas mahal kaysa sa M9 pero API SP naman na and may resource conserving certifications kaya mas madulas and mas tipid sa gas.
Been using it for over a year now sa daily scooter ko. Change oil every 2.5k kms, and so far, less wear and tear naman. Engine feels smoother, and surprisingly, di ganun kadumi yung langis pag draining time. Solid for daily use.
In my experience of trying many different oils, what I think are the best, as far as the engine running cool and smooth shifting are: 1. Redline 15w50
Im using zic sa vehicles namin. So far ok naman.
SK Zic 5W30 Diesel
I tried the redline 5w30 previously which has very high levels of moly (>800ppm) and the results were not as good as the moly-less 5w40.
Engine was noisier with the mix vs. the previously used redline 5w40. Iron levels are up at 6.3 ppm/1000 miles Oil usage increased by 1/2 quart over the redline 5w40 TBN/TAN levels are worse than 5w40 at comparable mileage
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