| down there. In colder climes a different issue and lower first number needed with synthetics. The greatest wear issue is at start up (first # important there) so keep the revs down and do not stress the engine until the oil warms up. Oil does not like short trips where it doesn't reach proper temp, it accumulates water and other impurities from combustion and the exhaust system life will be shortened. Been using 10W-30 in cars for a long time with no issues and I live in hot Fla. If you can find it you could switch to Mobil 1 0W-40 synthetic which has a greater zinc content than the Mobil 1 synthetic 10w-30 and with 0W- will be more beneficial than the 10w-30 at start up and the 40 weight with extra zinc and viscosity when warmed up will help the 90 k engine. But you need to determine if your engine needs a 40 viscosity at warm up for your driving conditions. Oil pressure will tell you this. Also Mobil 1 synthetic 5W-30 high mileage is a good choice, same zinc content as 0w-40 above and has additional conditioners for seals etc. 5W still a good # for start up oiling. Some tech info on these oils: https://mobiloil.com/~/media/amer/us/pvl/files/pdfs/mobil-1-oil-product-specs-guide.pdf IMO don't ever use the xW-20 oils in any daily driver car especially performance cars. Manufacturers came up with this to improve their overall corporate fuel mileage to meet Fed standards - Government at it again :-( However I have heard that F1 cars use a low straight viscosity oil like 5W and run at 15k rpm. Must work for HP needed but they pull the engines apart often and have mucho $$$$$$. Also note the use of synthetic oils allows a wide spread of the cold and hot rating in the viscosity of multi grade oil (like 0w-30, 0W-40, etc) because they are laboratory manufactured molecules designed to perform and generally have no viscosity improver (VI) depending on base oil. However the same is not true for mineral oils they use a lot of VI to get the cold - hot performance required. So a 5W-30 has more VI than a 10W-30 oil thus the greater spread of the numbers means more VI in the can and less base oil- bad. And additives wear out. So if you use mineral based oil keep the numbers closer.
ZUL8TR in Orlando,FL |
22:21:19 07/27/15
