Hi i have a 1999 camry, and the mechanic looking
after my car told me to top up oil with 20w 50 oil.
However i know the recommendation is 5w 30. I
live in daytona beach. And have no idea what to
do. I slightly topped the oil with the 20w 50
If the engine only burns through a quart between changes, I can see why he recommended the 20W50, he is hoping to give you some more additives and boost the life of the oil just enough to get you by until your next service, but you should not exceed 1 quart in the mix as the 20W50 is really heavy oil and can cause oil pressure problems if the concentration gets too high.
I'd find another mechanic. Adding 20w50 to a car that requires 5w30 is not good advise.
You live in a hot climate, much like Australia. There, the same car is specified for thicker oil since there is no government gas mileage regulation ( CAFE) as there is here. I'd use Rotella T6 in 5 W 40. One of my Camrys, a 99 I4, has gone 350K on that oil. It's "synthetic" and Wallyworld carries it in 4 quart jugs for about 20 bucks. 20W 50 might be a bit of overkill, although since there is a pressure relief valve as part of the oil pump system there is no danger of "excess oil pressure" causing a problem. If you have worn piston rings, valve guides, or valve seals no oil is going make much of a difference.
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