Conventional vs Synthetic Blend 25W-40 for 525EFI
#1
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Conventional vs Synthetic Blend 25W-40 for 525EFI
So, ordered 4 gallons of OEM Merc 25W-40 4cycle oil for oil change on my two 525efis. Open the box, and they shipped 2 gallons conventional as ordered, but mistakenly sent 2 gallons of 25W-40 4cycle Synthetic Blend.
My question is, while the manual only refers to conventional, would the synthetic blend mixed with conventional be a mistake? Blend in one engine and conventional in the other?
I prefer to follow the manual to a T, but wanted to bounce it off my OSO buds!
Thanks....
My question is, while the manual only refers to conventional, would the synthetic blend mixed with conventional be a mistake? Blend in one engine and conventional in the other?
I prefer to follow the manual to a T, but wanted to bounce it off my OSO buds!
Thanks....
Last edited by imartin; 04-27-2016 at 09:03 PM.
#4
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You'll be fine use it. Make and attempt to get as much of the old out but you'll be fine. Opinions are all over the board on this and many switch to sythetic. If you paid for reg and got synthetic I wouldn't call them out on it by any means.
#5
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It just exceeds your required conventional oil in a sense. Better under higher heat temps, rpm's, less varnish and holds its viscosity better. I believe most of mercs racing engines require it. just stick with it moving forward so you don't get a mix of the ongoing. Little won't hurt anything.
#6
I used the synthetic blend for a while and then started to have issues with lifters. But can't say for sure if the oil was the problem. If you ask opinions on oil, you will get 1000+ different answers. Here's 1001.. I now use Valvoline VR-1 20W50 conventional in my 525EFI's and change oil and filters religiously at 25 hours.
#7
I used the synthetic blend for a while and then started to have issues with lifters. But can't say for sure if the oil was the problem. If you ask opinions on oil, you will get 1000+ different answers. Here's 1001.. I now use Valvoline VR-1 20W50 conventional in my 525EFI's and change oil and filters religiously at 25 hours.
#8
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Conventional VR1 20W50: http://amzn.com/B00DJ4FIPQ
Last edited by SB; 04-28-2016 at 10:52 AM.
#9
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So, called the guys at Merc Racing Cust Svc. He said they are cutting all their oils over to the synthetic blend, so the conventional is being phased out. I like and prefer conventional with regular changes as HyFive578 mentioned. The every 25 hours scheduled that Merc has put out seems to be a formula that folks are really sticking to, and if they are not, they better start! I have 29 hours on my current oil, so overdue!!!!
Thanks guys!
Thanks guys!
#10
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I used the synthetic blend for a while and then started to have issues with lifters. But can't say for sure if the oil was the problem. If you ask opinions on oil, you will get 1000+ different answers. Here's 1001.. I now use Valvoline VR-1 20W50 conventional in my 525EFI's and change oil and filters religiously at 25 hours.
When Gibbs Racing first starting running the Toyota's, they had valvetrain issues. Solved with adding Zinc to the oil. Joe Gibbs racing oils was born.