I've been using Mobil 1 synthetic motor oil since my purchase, but on my last oil change the mechanic inadvertantly put in their default fossil oil (castrol? OEM Honda? I dunno) instead. I'm planning on putting Mobil 1 back into the engine again w/o flushing after 3k miles. Questions:

1. Is engine flush necessary? Would it affect the engine negatively (i.e. reliability/longevity/power/wear) if I don't ?

2. While currently having fossil fuel mixed w/ whatever scant drops that were left of M1 synthetic (engine wasn't obviously flushed on last change), would it hurt the motor to rev it like there's no tomorrow more than 1/2 the time for 3k miles b4 next oil change, which I tend to do?

3. addendum: Aside from the obvious, can someone please explain in techspeak why it's not such a good idea to mix 'em together.

Thanks for all of your inputs in advance guys.

BTW Good job on qualifying @ Imola Button! Hope all goes well Sunday.

 

People will go back to dino juice for a transition to a new synthetic, if you have been running synthetic for more than 10k miles, switch back ASAP, and dont do a lot of revving.

 

1. Engine flush is unnecessary.

2. Dino oil lubricates well, but probably won't hold up long under the stress and heat of the S2000 motor.

3. There is no real issue in mixing synth and dino, other than the fact that the beauty of synth is it's propensity to NOT break down under tough conditions. Adding even a little Dino to that, means the Dino will break down and form sludge. For "normal" motors, going to a semi-synth is beneficial for the added lubrocity. It can be a serious no-no to mix various synth fluids as the chemistry is different from brand to brand and they are not always compatible. Dino/Synth mixes don't have this issue.

 

The only issue is the possible reduced additive efficacy if the brands used were different. Nothing to have a cow over. Oil neurosis is not necessary.

 

think you guys are too paranoid.

 

Thanks for the input guys.

TTB,

We all worked hard for our $$ to attain the financial capability to own a Stook. For me, that reasoning alone is more than justifiable to get a wee-bit 'paranoid' over potential problems, however acute one may think it is. Won't hurt to ask for other's opinions, don't you agree?

Cheers.

 

If the mechanic put in dino oil after you told him that you wanted Mobil1, then the mechanic should drain out the oil and put in what you wanted without charge. Don't worry about the error, just change back ASAP and give the draining process a little extra time so that oil can drain down from the head. I think most of us are paranoid about our S's, so you're not alone.