15w40 oil. diesel? RB? what????

[kouki_s14]

summer was coming up and i decided to get some thicker oil since socal isnt the coolest place to be. so i ordered a case of 10w40 about a week ago. it just arrived today and i look and saw that they sent me 15w40 instead. i searched around a bit and 15w40 seems to be recommended for diesel engines. anyone think i will have problems just using this oil in my RB? i mean there's only a 5 weight difference, but the whole diesel thing worried me a bit. i think i might be okay, just wanted to get some opinions.

thanks

henry

[sunnys14]

i used 15w-40 in my turbo KA last summer. hotter climates need thicker oil to protect your engine.

[zoomswimmer]

the 40 is the weight of the oil the. When there are two numbers (like 15 and 40) that just means it's a multi weight oil and the w means that it can be used in cooler climates. The 15 and 10 are how low of a temp they can go before they get too thick to run in an engine. Here in Utah in the winter, I use 5w30 since is gets below freezing. I can get away with using 10w30 but on cold mornings, the engine has a harder time starting.