Hello.. I have a '72 Corvette 454 4spd about 5000kms the engine was rebuilt and tweaked a little ( not too radical) it's time to change the trans/rear diff. oil, So I thought I could use some advice I want to go synthetic... Also engine oil recommendations. I was using Moblie 1 15w-50 with Lucas but after reading the forum on Lucas oil supplements.....not anymore! I don't put a ton of kms on it every year and I store it in the winter. But I do drive it hard when it's out......the lack of points on my licence will prove that So any advice/recommendations??? Thanks!!!