Quote:
Originally Posted by Bayou_Pro
On a serious note. I have an engine building background and have worked for Toyota Service for 6 years. I would not recommend changing to a heavier oil, from a bearing clearance standpoint and from a VVTI standpoint. Yeah some people have run 5W20 but this only effects cold start but going to a 5W30 will be a all around thicker oil. On a very tight tolerance engine this will result in higher oil pressure and reduced lubrication to the bearings. Will it hurt something, well I can't answer that but I wouldn't risk it.
You could try a few different oils to see if that would change the sound. It's expensive but you might pick up some Redline 0W20 and give it a try. It's quieter in my CTS-V then Mobil 1. I haven't tried it in the 4Runner yet. About to change the oil and catch a sample to have analysis done to compare Toyota oil to Mobile 1 and then Redline. Just curious TBN numbers between them.
Good luck.
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^^^^^ This^^^^^
Redline is a True group 4 and 5 synthetic base oil with a high moly content added to the additive package. Moly is a fantastic additive and has a plating affect on internal parts, But, needs heat + pressure + TIME to do its thing. Guys on the Ram forum have done some really impressive things reducing engine noise (Hemi Tick) using Redline oils. If you go the Redline route give it 500-1500 miles for the moly to do its thing.
PQIA just tested the Toyota 0w20 and its LOADED with moly, 700+ppm. That's huge!!!! But I'm not sure if its a group 3 base oil (fake synthetic) or a true group 4-5 synthetic base. Either way both look go on paper!
