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Will Switching to 0W-40 be Better for a Toyota Tacoma in a Hot Climate?
 
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Question:
Will Switching to 0W-40 be Better for a Toyota Tacoma in a Hot Climate?
My 2005 Tacoma has a little over 60,000 miles now. It has some "cold start knock" - piston slap, that so many recent engines have. Once warmed up, it only has a faint bit of slap at idle. I have been using Mobil 1 5W-30 since about 15,000 miles. Now that the vehicle has some mileage and is out of warranty and since the weather can be very hot for long periods of time in South Carolina, would it be advisable to use 0W-40 now? Thanks!
-- Robert Boudreau, Boiling Springs, SC
Answer:
A 40 grade (0W-40) would provide some relief but your engine does not see this viscosity until it has warmed up. Since it appears to be only an issue during warm-up, you may want to try Mobil 1 15W-50. This will provide an initial viscosity that is higher than the 0W-40. This assumes that the 15W will be adequate low temperature flow for South Carolina mornings.
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