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Originally Posted by JeffreyP
Not another oil discussion but just a thought:
- We should feel very safe changing oil at 3000 mile (dino oil) with 4-5 quart sump (any other car)
- In my car, it holds 8.5 quarts
- a little calculation say
3000x8.5/4 = 6375 or
3000x8.5/5 = 5100 miles
- so it should be safe with oil change interval of 5000-6000 miles even if I only use dino oil?
- I drive about 20000 miles a year and am changing oil every 5000 miles anyway so about 4 oil change per year. My mechanic charges $70 for synthetic and $30 for dyno. Now that's about $160 saving per year - I know it's not going to break me, I am just trying to justify spending it. My questions are:
1. Does using synthetic actually overkill if I change oil at 5000 mile anyway?
2. Is it really safe for an 98 E-320 engine (FSS) using dino oil (but only use it for 5000 miles)?
Thanks in advance,
JeffreyP
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Yes, I think it's overkill but we all do it. What people should understand is that it's more important to top off the oil with new (and change the filter if possible) to maintain proper extended interval changes. I think 5K is a good time to replace it for most drivers using synthetics. For your 98 with dyno, don't do it - switch to synthetic. Remember the problems MB had with earlier MLs using dyno with FSS? That's solid data that extended changes with dyno is not a safe thing to do.
I follow the FSS and have performed oil analyses on some of my used oils. There is absolutely no problem at all. I wish MB did recommend filter changes in between FSS changes though.