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I live in Southern Arizona, a pretty hot place in the summer I use 10W30 in my F and in my truck due to the summer heat and the mild winter. It's been working well for me. IMO, the 40 would be a bit to thick for general use.
OP, did you originally purchase your F in the Philippines? If yes, what grade does your owner's manual recommend? What do the local Lexus dealers recommend?
I spent a July & August in your beautiful country. From what I recall, it wasn't so much the heat as the humidity.
OP, did you originally purchase your F in the Philippines? If yes, what grade does your owner's manual recommend? What do the local Lexus dealers recommend?
I spent a July & August in your beautiful country. From what I recall, it wasn't so much the heat as the humidity.
My car was imported from U.S.,its an 08 USDM,our lexus dealer here sold the isFs twice the price when imported...the temp during summer could go up to 100-107*F (daytime) yes its very humid here also...the local shop where i go to always recommends 10W40 for cars that normally use 5W30 because the head mechanic always says its very hot in our country,so a higher viscosity oil can take a little more beating (hard driving during daytime)...im thinking of trying 5W30 on my next oil change,just want to hear first what you guys have to say....