My truck calls for 5w30 but also wanted to try R&P over the winter. I'm in MN and it hits -20°F easily so I do run 0W if I find it cheap and it's in the truck right now.
So I found a viscosity calculator and it said to get to 30 I needed 60% 0w40 and 40% 0w20. So I found a jug of 0w20 R&P on sale and just made my own 0w30 blend with M1 Euro 0W40. It came out be that I needed right about half a 5q jug anyway.
Sure it's not 'full strength' in terms of how much it could do in all its magic restoring and protecting cause it's basically diluted, but I don't care. Call it Diet R&P, if you will. If I check it after 2500 miles and it's all good I'll go to 5k.
So I found a viscosity calculator and it said to get to 30 I needed 60% 0w40 and 40% 0w20. So I found a jug of 0w20 R&P on sale and just made my own 0w30 blend with M1 Euro 0W40. It came out be that I needed right about half a 5q jug anyway.
Sure it's not 'full strength' in terms of how much it could do in all its magic restoring and protecting cause it's basically diluted, but I don't care. Call it Diet R&P, if you will. If I check it after 2500 miles and it's all good I'll go to 5k.