Does the summertime require thicker oil?
There is never a need to goto a higher viscosity. Oil never will be or ever has been measured in weight. The w after the number on the bottle stands for WINTER not weight. If your owners manual calls for that viscosity that is what you should use all year round. You may want to check into A synthetic oil which gives you better protection and longer drain intervals which in the long run will save you money.
Amsoil synthetic oil has the longest drain intervals on the market today when using the Amsoil Eao oil filter which also has the best media on the market.
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According to the car manufacturers, yes—but don’t go too thick. Most new cars today are supposed to be filled with 5W-20, which is pretty thin. Car manufacturers usually list 10W-30 as acceptable for summer temperatures. Thinner oil has less friction inside the engine, which is good for fuel economy. Engines have been designed to run on this thin stuff for a number of years, with improved surface finish and low-friction parts like roller camshafts. Check your owner’s manual for the viscosity recommendations for your vehicle. Older cars may require thicker oil, but it’s still not a good idea to just pour five quarts of 40-weight in just because it’s summer. Thicker oil takes longer to start flowing properly when the engine isn’t warmed up, and can also reduce fuel economy. If you live in Phoenix and tow a huge trailer, the temptation is to use thicker oil to keep it from thinning out excessively and damaging your engine. Unless you’ve got an older car, made in the era of 20W40 or even s
