Review of Red Line 11404-12PK 10W-40 Synthetic Oil - 1 Quart Bottle, (Pack of

Customer Ratings:

The car this is used in is a Mercedes CLK430, which factory dictates I need a 0w40. In the summer, it's hot and don't need the 0w weight oil, so I'm only concerned with the 40w. Immediately after changing the oil over to this, the car ran smoother and cooler. It so smooth at times I had to look at the tech to make sure it was running. I've used AMSOIL, Royal Purple, Mobil1 HM 10w40, Shell 5w40 synthetic, and nothing ran as well as Redline.

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I've been running Redline synthetic oil in my 5.0 track toy for years now, and despite seeing coolant temps as high as 240 on one occasion and oil temps regulalry as high as 275, my Blackstone labs oil analyses keep coming back with wear on the low end of the normal range. You can run Redline with confidence.