5-20 or 5-30 oil?
I couldn't get "search" working so I'll ask here;
My 2001 owners manual specifies 5-20 so when I did the first oil change when I bought this car at 25K miles, I used that (Motorcraft semi-synthetic).
I just heard on another site that the cars sold to middle Eastern countries (Saudi Arabia etc.) have 5-30 spec'd.
I am planning a trip or two to Vegas and parts North and East which involves travel through some very hot (115) and steep (Baker Grade,12 miles 6%) roads and I was wondering just how good this 5-20 Wt oil will hold up.
I was also wondering what the fleets use, taxi and police.
My last car had a 351C engine and I always used 20-50 Castrol and never had one problem in 220K miles (besides valve seals at 150K).I used to take that car across the desert all the time at 80 MPH.
Should I use 5-20,5-30 (or 10-30)? I'm sure that gas mileage will be off a hair,but I don't mind. Thanks-Brian
2001 Grand Marquis LS, 25K miles mint (edit; now 56K miles) Finally a vehicle with NO LEAKS !