OMAHA

where is the oil control valve located?

PureDrifter

iTrader: (10)

one on the top front of each cylinder head. search, there's a few threads on replacing them.

ZOTS

Old thread but you are absolutely correct. Just google actual tests, all the research shows no difference, and with today’s gas additives you generally should not need additives. I have run my 98 LS400 on regulars since I purchased it at 132k I can get 29MPG HWY I now have 308k and the care still runs smooth. Regular changes of air filter and cleaning of the MAF, throttle body, and idle air mix path. I do add some seafoam once a year to the tank just to be sure injectors stay clean. No idea if the seafoam helps but I have seen it help on my yard equipment so what the heck. It doesn’t seem to hurt.

My son has had this care for the last 4 years and it has developed a faster Idle than I remember so currently trying to research that issue. Other than that it now has a small oil leak I cant seem to find but its someplace in the front of the engine. He had the timing belt done about 30 k ago and I know this was not and issues before then so it may be related.