I would first consider what environment / climate the car is operating in at the moment. 10W30 may be fine for Canada in winter, but not the Bahamas in summer!
In general. I would have thought that the 308 pre-dates the technology of 10W30-grade oils. I would agree that 20W40-50 (or maybe 15W-40) is better suited to the parameters the engine designers worked to. I'd check the manual & a Ferrari service department too.
Yes, definately 20W/50. Any 20W/50 motor oil will do. I use the CarQuest brand because it is cheaper. I used to buy the more expensive oils, but the CarQuest stuff is made by Valvoline. I would not recommend the synthetic oils. The petroleum based oil swells and lubricates the engine seals. The synthetic oil can allow the seals to shrink and leaks may develop.
For any high revving engine that deals with a lot of heat it's the only brand I'd use. Reduces friction and wear to incredible amounts. My car has only had Mobil 1 in it and when I did my valve adjustment at 120,000 miles only one valve needed to be adjusted (out of 16). That's pretty amazing if you ask me. No scorching or discoloration (browning) of the oil on the head either. I as well as the previous owner change(d) it every 3,000 miles. When I used to turn wrenches all our engine builders told us to use Mobil 1 exclusively. As for the seals and such, I've never had any problems period. My Turbo seals are still good and although I haven't pulled the head, I'm not burning oil so I'd assume my valve guides and piston rings are in good shape. By the way, every Porsche that rolls off the assembly line has Mobil 1 in it. If it posed any problems to seals and such do you think they'd expose themselves to the liability if it were to cause expensive problems that could result in them having to rebuild thousands of engines due to seals going bad.
Now for the Gear box, use GM Synchromesh. I'm not kidding on this one. Much better than Redline or Mobil 1. Improves shifts like you wouldn't believe. Try it and you might actually be able to get that QV into second before the gearbox warms up
Andrew, I would ask your friend to change to synthetic lube. Any one of the major brands will do. BUT first he will have to flush the engine first with flushing oil and then fill-up with the sythetic. They're more expensive but well worh it.
I use Valvoline VR1 20/50 Racing P/N 211. It is dino based. Because I change oil in my 308 every 2,000 miles it doesn't have a chance to get dirty or worn out. Premium protection on those 90 degree days in a traffic jam or making 7k shifts on a spirited drive for less than half the cost of synthetic.
Redline 75/90 NS synthetic gear oil for the transaxle though. Great stuff!
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