Oil pressure

Recommendation... my oil pressure is 60 psi in my john deere 450 till like 30 minutes later it drops to 10 psi. I run 15-40. Is there any thicker oil I can use to get me by for a couple weeks. I realize i probably need a rebuild
 
A single weight oil will help but that is a huge drop. 30wt, 40wt, 50wt. The 40 and 50 will be in the motorcycle section. Castrol used to have a 20/50 that was awful heavy. Not sure if they still do.
 
I've been told that the dual viscosity oils are, more or less, the weight of the smaller number when they're cold, and they have additives to make them behave the same as the bigger number after they're hot. So based on that, 20-50 is 20 W oil that behaves like 50 when it's warm. But it doesn't.

From experience, 10-30 is not as heavy as 30w when it's warm. Not even 15-40 is as heavy as 30w. I work a 750 cubic inch engine with drip oilers (runs my shop) and 15-40 left the piston so dry the next day I could hardly start it. On 10-30 it ran dry while it was running! I shut it down for all the bad noise it was making! 30w stays. My dad ran his JD 80 on 15-40 and complained about it smoking. We switched to straight 30w, and it's noticeably better. The "40" is not as thick as the single 30w even after it's warm. So in my experience, the dual oils are thinner, no matter what they claim.

Hope this helped.
 
The W stands for "Winter Weight".The first number 15W is the viscosity of the oil at cold temperature, and the second number 40 is the viscosity at 100 ?C. The 15W40 designation means that the oil is a multigrade oil. It has the viscosity of 15W when cold and the viscosity of SAE 40 when hot. This means that one type of oil works in all temperatures.
 
If it were mine, and didn't leak, I would try some 15w50 synthetic and see how that fared. 15w50 synthetic is both thicker when hot, and less prone to shearing down than a conventional 15w40. Conventional 15w40 traditionally began as 15 weight oil and had additives to reach 40 when hot. Modern group 2 dino base stocks are better than the old group 1 dino, so it's more like a 25 weight that passes for 15w25 without additives, and then additives to hit 40. But synthetic naturally has a better viscosity index. So a synthetic 15w50 is more like a base stock that passes as 15w40 on it's own merit, with no additives, and then a bit of additives to reach the 50. Synthetic 10w30 and 15w40 require no additives at all to meet the hot and cold flow requirements of those grades. Remember, the W is Winter. It's a pass/fail flow test, not a measure of viscosity. The traditional viscosity number is only used in this position because it's easier for people to understand. Oil is still way thicker when it's cold than hot. If any of that makes sense, good... I'm a bit of an oil nerd.
 
There is an oil pressure regulator on the front of the engine. under a large plug has a spring and poppet valve change the spring could be when warm it loses tension.
 

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