navyguy Posted October 24, 2014 Report Share Posted October 24, 2014 Looking in the spitfire 1500 handbook it says that for dependant on the ambient temperature the grade of oil can range from 10W40 all the way up the grade scale to 20W50. Can anyone tell us why we tend to use the more expensive 20W50 rather than the standard 15W40??? Cheers Navyguy Link to comment Share on other sites More sharing options...
thescrapman Posted October 24, 2014 Report Share Posted October 24, 2014 Because 30 years ago, it was standard 20W50 and more expensive 15W40. Technology moves on and so does demand, hardly anything needs a 20W50 now. Modern 15W40 are too thin really for the Triumph engines, especially ones that are not in 100% condition, it tends to give low oil pressure and find gaps to leak out of that a 20W50 doesn't. And try to avoid the cheapo 20W50's, some of them really are a bit rubbish. Look out for Valvoline on special at Euro Car Parts, or splash the cash and go for Millers 20W50 (or even 20W60) Classic Sport. Neither will disappoint. Link to comment Share on other sites More sharing options...
navyguy Posted October 24, 2014 Author Report Share Posted October 24, 2014 Cheers for that, I was wondering why the handbook gave a wide range of oil grades. Navyguy Link to comment Share on other sites More sharing options...
AndyTV8 Posted October 24, 2014 Report Share Posted October 24, 2014 Valvoline VR1 20/50 would be my recommendation ..... Andy Link to comment Share on other sites More sharing options...
mishmosh Posted October 24, 2014 Report Share Posted October 24, 2014 Morris oils do a good 20/50. Link to comment Share on other sites More sharing options...
mishmosh Posted October 24, 2014 Report Share Posted October 24, 2014 Morris oils do a good 20/50 Link to comment Share on other sites More sharing options...
GrahamB Posted October 28, 2014 Report Share Posted October 28, 2014 The grade of oil specified depends on the ambient conditions. According to the owner handbook, 20W/50 is recommended for operation from 0 to 30 deg C., 15W/40 from -10 to 30 deg.C. If you care to drive around with the top down at -30 to -10 deg.C then you should use 5W/40. I always use a 20W/50 from a reputable supplier and maintain 60 psi cruising on a warm day. If it is -10 deg.C then I probably will not be driving so no need for the 15W/40. Link to comment Share on other sites More sharing options...
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