I have a 1995 vette with lt1 350 motor, 300 hp 345 tq, auto trans, 46000 miles. the mgf. say mobil 1 5w30. the lt1 run hot from the factory to meet emmisions the cooling fan dosent come on to 228. I also live in florida. Mostly daily driving with a little spirited driveing, What would be the best oil? Also any trans and rear diff recomendes? and what about additives for all 3, rear diff says use GM Limited Slip Differential Additive some people say 1 4oz bottle some say 2. also any fuel additives. thanks for any help