CBR650F Mechanic Overfilled Oil, Claims High Mileage Needs More. Is This True?

[frank]

Hi everyone,

I'm hoping to get some advice from the community about a recent oil change experience on my 2016 CBR650F.

My bike has just under 50,000 km, and I recently took it to a local mechanic for an oil change. I switched to Liqui Moly 10W-40 Street. However, I later found out he had put in 3.4 liters of oil, even with a filter change. As we know, the manual specifies 2.9 liters.

Unfortunately, I had already ridden the bike for over 100 km before I realized the mistake.

Here's the part that I need your opinion on. When I spoke to the mechanic about it, he gave me a very strange excuse. He claimed that high-mileage engines (like mine with ~49,000 km) require more oil to compensate for wear and tear. He even had a "sliding scale" he uses:

• 3000km = 2.7L
• 10000km = 2.9L
• 20000km = 3.2L
• and so on...

This sounds completely wrong to me, but I wanted to ask the experts here.

So, my two main questions are:

1. Is there any logic or truth at all to what this mechanic is saying about adding more oil for high-mileage engines? Or is this complete nonsense?
2. By riding for over 100 km with that much excess oil, what potential damage should I be on the lookout for? is there anything else I should be concerned about (seals, gaskets, etc.)?

Thanks in advance for any insights. Really appreciate the help from this community.

 

[frank]

hmm

 

[58]

Drain it to the level to be safe, according to post below your bike already has some extra.

If I had to guess the shop filled the oil to the level of the 650F and yours is a 650R. When Honda released the R version they lowered the oil capacity requirement just over a half quart because they discovered the bike didn't need to run as much oil as originally thought. Nothing else changed but the length of the dipstick.

So you are fine as is. My guess is at the level you are indicating would be in the middle of the F dipstick.

I'd leave it.

 

[Bran]

Excessive overfill can cause damage, but I'd have expected a problem by now. Definitely drain to the correct level

 

[MacRoadster]

Here's the part that I need your opinion on. When I spoke to the mechanic about it, he gave me a very strange excuse. He claimed that high-mileage engines (like mine with ~49,000 km) require more oil to compensate for wear and tear. He even had a "sliding scale" he uses:

• 3000km = 2.7L
• 10000km = 2.9L
• 20000km = 3.2L
• and so on...

With that scale... I wonder where he puts the oil in a bike with 100000Km... on the fuel tank? 🤣🤣🤣

I'm not an expert, but I think we should fill it to the recommended level and if the bike "drinks" oil, just add some when needed to keep it on the level.

 

[frank]

Thanks for reply everyone, last night i come back to the mechanic and ask him to drain it but it was too late they're at closing time. Today i will ask him to drain it, I hope theres no problem with my engine, but recently i notice my bike felt a little bit heavier and i hear something from the engine like piston slap or clutch noise but im not really sure what sound is it. i didnt notice any burn oil from exhaust though.

 

[frank]

I mark it with red line, is it the correct oil level ?

 

[Brammers]

Anywhere on the flat bit will be fine. Between the two raise lines is the actual range.

J

 

[frank]

Thanks, I already drain it just now, he drain about 450ml and now oil level is a little bit upper on E (MJE) and no longer over the line. Am i good ?

 

[Brammers]

Perfect!

J