If it was not for bad luck I would have none at all!

the first number is the viscosity of the oil when its cold, the W means winter use OK.

he really needs to check the pressure with a good mechanical gauge. If its really close to zero at idle then try the thicker oil.

however it all cost money to do--unless his auto parts store offers free tool rental.

that is why I thought just drain the oil from the pan and put in 4 quarts of 20w-50. At $4.0? a quart he could get it for around $20. Don't think it really hurt anything, my 340 I use 20w-50 all the time and drive till the salt trucks hit the road. Now in sub-zero temps I hope its in a garage at night. Marvels Mystery Oil thins oil if needed, add a 1/2 a quart once temps drop below freezing