FreeWoRLD

This is the Mobil 1 FS SP version that might prevent LSPI issue. Comes with additional timing chain protection as any SP rated oil is tested for both LSPI and Timing chain wear protection by API. It has considerably less calcium levels compared to the old formula (SN only version). Calcium additive is believed to be the top contributor to LSPI.

Just picked it up at my local walmart this past weekend and changed to it for the very first time in my 70k miles 2018 GLC 300. I believe the cost was around $28-$29 for 5 qt.

The car has run on the high calcium SN version of the Mobil 1 FS up until it has reached 57k miles (first owner). Starting at 57k miles and until 70k (on my ownership), still ran on API SP rated oil but a non-approved one (had no choice - long story). So at 70k miles, I have finally switched over to proper 229.5 approved and SP oil. I plan to continue on this SP version of M1 0W-40 for the rest of vehicle's life and want to keep it as long as it runs.



Here's a nice graph to show the differences in API versions;

DanD.

Hey, thank you for Walmart reminder. I like Castrol better so just bought for 2 oil changes
$26 for 5qt
Castrol EDGE Euro 5W-40 A3/B4 Advanced Full Synthetic Motor Oil, 5 Quarts https://www.walmart.com/ip/145736795

CaliBenzDriver

I find it odd that Cyl.1 right next to oil pump and water pump are most impacted by catastrophic engine failures...

It wouldn't surprise me to find an oil pump solenoid is disabling piston cooling on this modern engine...

Good engine oil grade is important - It's even more important for it to be actively circulated over hot moving parts by piston cooling squirters.

Under some conditions controlled by ECU, active piston oiling may be disabled.... Results may vary.

stath

Two crucial questions for the owners of the cracked pistons:
1. did you do all prior service at the dealer or some indy? I do not trust indies, especially during tight economic times, who knows what oil they use?
2. did you do all the refueling yourselves, or had family members do it? If you let your family members drive and refuel the car, who knows if they didn't accidentally buy the 87 oct. fuel?

Additionally, I think the 10K interval for oil changes is too long for a small 4-cyl engine. Other manufacturers have a much shorter interval. My Acura RDX (4-cyl turbo) had a 4K interval for oil.
My BMW540 had a 10K oil interval but it had a huge 8-cyl 5L engine, running at low RPM.
I get oil replaced at the dealer at around 5K in my 2018 GLC300. (I drive less post-pandemic, do shorter trips, work from home).

juanmor40

I personally find surprising that people think these cars are sensitive to fuel quality. Regardless of fuel quality these engines have to last, inefficient perhaps, not giving the expected fuel mileage, not delivering the expected acceleration, I am fine with that.

However, breaking before 100+K miles is completely unacceptable and inexcusable for any engineering standards. MB knows better, they just blew it on this one.

On dealership vs Indies, the jury is out there. I am on the boat that some franchised dealership are trash at best, and the only advantage they may have over an Indy is the access to latest information if any

I have one on my list that I will never recommend not even to an enemy, AutonNation knows which one I am talking about

sn202020

The engine oil capacities are different even the same number of cylinder, and that needs to be considered for deciding OCI.

RDX or many 4 cyl engines are 4~5 liter capacity.
And GLC300 has 7~7.5 liter oil, which will last longer than 4 liter.

still 5K ~8K miles OCI is better than 10K. I personally change at 5K.