skyman Posted May 8, 2012 Report Share Posted May 8, 2012 Moved from upstate NY to Fla. Just had my oil changed. I always bring my own oil and filter. I use Moble 1 5w/30 the weight GM calls for. The mechanic sugested that I switch to 10w/30 given the hot temps down here. Any opinions on this? Sky 2005 Deville 4.6 northstar Link to comment Share on other sites More sharing options...
JimD Posted May 8, 2012 Report Share Posted May 8, 2012 Stick with the viscosity the GM powertrain engineers recommended. They really do know what they are doing. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
navion Posted May 9, 2012 Report Share Posted May 9, 2012 I would not change the viscosity that you have been using. The engine in your Cadillac is designed for that weight oil. Remember, once your engine is running and up to temperature, it dosen't know if it is in Florida or in the Finger Lakes! The 5 weight aspect of your oil helps insure lubrication during the critical time following a cold start in any climate. If you were North of the Artic Circle, I would think about a 0-20 weight. I hope that you enjoy Florida. Britt Britt Link to comment Share on other sites More sharing options...
Ranger Posted May 9, 2012 Report Share Posted May 9, 2012 GM spec'd it for 5W30. That said, I still use 10W30. In fact if you read your owners manual I believe it still says 10W30 is OK. Link to comment Share on other sites More sharing options...
cdgrinci Posted May 9, 2012 Report Share Posted May 9, 2012 Either would be fine; I believe I would stick with the recommended (just because). In the heat of Florida (or anywhere, once the engine is 'up to temp'), the top number is more important. Chuck '19 CT6, '04 Bravada........but still lusting for that '69 Z-28 Link to comment Share on other sites More sharing options...
OldFart Posted May 9, 2012 Report Share Posted May 9, 2012 Ditto. The first number is the cold viscosity and the second number is the hot viscosity. I've lived in Florida for 40 years and I use 5w-30. OldFart Link to comment Share on other sites More sharing options...
Safari2000 Posted May 10, 2012 Report Share Posted May 10, 2012 Being an old fart I'm surprised that you remember to put oil in your car!!! LOL Happy Motoring all. Link to comment Share on other sites More sharing options...
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