Built LM7 oil recommendation
- Thread starter Chevyc10
- Start date
M1 5w-50?
Pretty much any off the shelf full syn 0/5/15w-40. What's the coldest temp you'll be starting it at? and does it have a high volume pump? These engines don't need a hvp unless the clearances are wider so do you know what the clearances are?.
Engines with low hot idle pressure like fords (15 psi) benefit from a hvp but not so much these. Going from 30 to 40 gives me 35+ at hot idle with my lm7 and lq4 both stock though but bulletproof. I forgot what the psi was with 30 grade I think 28 psi? Been forever since these engines pumped 30 grade I switched to 40 long ago. No real need for a high pressure spring either with these. What's your hot idle oil pressure with redline 10w-40 and what's your hot cruising pressure.
Most 10w-40's aren't anything spectacular but these engines will live forever on conventional or syn blend 10w-40 if changed frequently but since those bearings are getting loaded up with a lot more power so I'd skip it. But redline 10w-40 is leaps and bounds better than off the shelf 10w-40. The best off the shelf 10w-40 I know is Mobil 1 high mileage but it's not worth buying at its price.
Engines with low hot idle pressure like fords (15 psi) benefit from a hvp but not so much these. Going from 30 to 40 gives me 35+ at hot idle with my lm7 and lq4 both stock though but bulletproof. I forgot what the psi was with 30 grade I think 28 psi? Been forever since these engines pumped 30 grade I switched to 40 long ago. No real need for a high pressure spring either with these. What's your hot idle oil pressure with redline 10w-40 and what's your hot cruising pressure.
Most 10w-40's aren't anything spectacular but these engines will live forever on conventional or syn blend 10w-40 if changed frequently but since those bearings are getting loaded up with a lot more power so I'd skip it. But redline 10w-40 is leaps and bounds better than off the shelf 10w-40. The best off the shelf 10w-40 I know is Mobil 1 high mileage but it's not worth buying at its price.
Mobil 1 or PUP in a 40 weight. Too easy.