Is semi-synthetic 10W-40 still a thing?

JC1

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5,999
Location
Oshawa, Ontario Canada
The OP is located in France. I'll add my two cents. 10w-40 is widely available in US. Walmart and auto parts retailers readily have it available. Almost any grade you want, you can find easily.

In Canada our choices are less abundant. 10w-40 is not easily available at Walmart Canada and Canadian Tire. Same with 20w-50.

If you are comfortable running 10w-40 that's all that matters for you. Based on what I read here, people that use 10w-40 in Bitog try it when they have a motor that leaks or burns a lot of oil and they want to slow down that oil consumption.
 
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2,696
Location
San Rafael, CA
The OP is located in France. I'll add my two cents. 10w-40 is widely available in US. Walmart and auto parts retailers readily have it available. Almost any grade you want, you can find easily.

In Canada our choices are less abundant. 10w-40 is not easily available at Walmart Canada and Canadian Tire. Same with 20w-50.

If you are comfortable running 10w-40 that's all that matters for you. Based on what I read here, people that use 10w-40 in Bitog try it when they have a motor that leaks or burns a lot of oil and they want to slow down that oil consumption.
Honestly I neither see a reason for 10w-40 or 20w-50 in modern vehicles unless it has mechanical problems. I'm shocked how much of both of these we sell at the parts store!
 
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4,632
Location
Decatur AL USA
Honestly I neither see a reason for 10w-40 or 20w-50 in modern vehicles unless it has mechanical problems. I'm shocked how much of both of these we sell at the parts store!

Joe Average thinks about oils differently.

10W-40 is better than 10W-30 because it's thicker without being thicker.

Don't use 5W-40 instead of 10W-30 because it's thinner.

4 Cylinders work hard and run hot so they need 20W-50.

Bigger is better. 0W-20 is minimum spec oil. It costs so much because it's hard to make it that won't immediately destroy an engine. Use 20W-50 instead. The bigger the better.
 
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24,264
Location
Dallas,Tx USA
OW20 would probably work fine for Myrtle in her muscle car driving back and forth to church every Sunday. But if she were to get on the Autobahn driving WOT for hours on end she'd probably need to bump up the viscosity. From reading various FSM's,owners manuals,and Blackstone's comments on uoa's,this is how I infer picking the proper viscosity. 😁
 

SR5

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5,902
Location
Down Under
And right beside it is Valvoline MaxLife 10W40 semi-synthetic

 

M119

Thread starter
Messages
508
Location
Brittany, France
I never fall for the "thicker is better" and i would probably use a 5W-30 during winter if it was affordable to help with short trips and a cold engine. However i mostly do highway driving at 110/130 km/h around 3000 rpm so the good old W40 makes sense i think. I would be curious to try a W50 just to see if it quiets down the noisy timing chain (the M111 engine is notorious for that) as well as the slight tappet tick when cold.
 

M119

Thread starter
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508
Location
Brittany, France
Did anyone have success quieting down a noisy timing chain with heavier oil ? The M111 engine sounds like a metal bucket full of marbles (they all do).
 
Messages
4,632
Location
Decatur AL USA
Until recently I think most European 10W-40 Blends were around 65% GI / 35% GIII Base Oils because GII was seldom used in Europe.

Most quality modern USA made 10W-40 were Group II.

Different ways of accomplishing the same thing. So most USA based members have little experience with 10W-40 blends.
 
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3,854
Location
Slovenia EU
Did anyone have success quieting down a noisy timing chain with heavier oil ? The M111 engine sounds like a metal bucket full of marbles (they all do).
Try an oil wich has MoDTC in it....there is one study here on bitog wich supports that teory...but since we have new forum I have lost all my teacked topics....
 

M119

Thread starter
Messages
508
Location
Brittany, France
I am doing a few researches here and it looks like people are often more successful quieting down a noisy engine switching to lighter oils rather than thicker. I am really tempted to try something else than a W40 for the first time. I read about another user with a 00 MB E430 who made his engine silent by switching from Mobil 1 0W40 to 0W20. Engine ran cooler too and throttle response was improved.
 
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