Just a follow up on a suggestion I received in this forum to try Castrol Syntec blend to prevent the oil foaming which was occurring on my '06 Tundra. I have about 2K miles on the 5w-30 Syntec blend now and this absolutely cleared it up. No more gunky foam all over the inside of the filler cap like I was getting with conventional Penzoil 5w-30. I am considering going to straight Syntec next oil change since it seems like the price is not much more then the blend.
Thanks!
penzoil is shit. avoid like ugly chicks!
I use Castrol 5W-30 (as recommendation in the manual) in my 06 Tundra. No foaming at all.
ANYTHING but Penzoil in my experience. I've only used it twice and had grief both times (Pennzoil 5W30 - lost oil pressure within 50 miles of the change. Dumped it and replaced with Shell and Castrol premium conventonal oils and the oil pressure came right back. Not sure if it was foaming or viscosity breakdown or a combination - but what came out of the warm crankcase in both cases was about as thin a kerosene. Two differnt vehicles. Same problem. Same solution. Neither vehicle has had the problem before or since. Only had that problem one other time, with the cheapest ESSO motor oil you could buy at a lube-shop (came in a green can).
In all 3 cases the oil light came on at highway speeds. With the Penzoil, it went out at idle and came back on as soon as the engine was sped up to about 2000 RPM. With the ESSO it never went out.
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Ditto that about Pennzoil being shit. I used it back in the seventies and there was always a foamy gelled goo in the oil cap and valve covers.
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