I would STRONGLY advise against using any kind of engine flush, such as the Gunk flush mentioned earlier. Assuming you are correct and there is some build up, if you flush it you are loosening it all at once and hoping it gets trapped by the filter before it lodges in some opening its not meant to get lodged in and where it can do serious damage.
I speak from first hand experience about sludge, and it is not in and of itself expensive. There are millions of cars on the road with it and whose owners have no idea its even there. What can, potentially be expensive is when its ignored and allowed to accumulate, or when drastic measures are resorted to such as flushes. Both are potentially expensive. Wrong approach from both ends of the spectrum.
If you are already a syn oil user, my suggestion would be to do two or three 3K OCIs with either Pennzoil Platinum or Ultra (depending on availability and what your wallet can bear). These are two high detergent synthetics that will slowly and safely remove any build up.
For my (confirmed) sludged Toyota I use Platinum with 10% MMO (which was 12 ounces for my sump size). The small amount of MMO is a cheap, safe method of helping the Platinum along as I have some significant, thick deposits that I am dealing with.
In your case MMO is purely optional, and IMHO not necessary if you go the Pennzoil Platinum / Pennzoil Ultra route for a few short OCIs. If you decide to add it, I would work out a 10% concentration using your sump size and add it just for the last 1,000 miles. With a good detergent oil like Pennzoil Platinum or Pennzoil Ultra, MMO is strictly optional and you only need a small amount over a short interval to get the benefit of it. With the stubborn deposits I have, my use of MMO is to soften them up to help the PP remove over time. 10% is enough MMO to accomplish this.
I am not recommending MMO in your instance; only saying that if you decide to add it in, then this is the safest way to add it and all that you need to add.
-Spyder
I speak from first hand experience about sludge, and it is not in and of itself expensive. There are millions of cars on the road with it and whose owners have no idea its even there. What can, potentially be expensive is when its ignored and allowed to accumulate, or when drastic measures are resorted to such as flushes. Both are potentially expensive. Wrong approach from both ends of the spectrum.
If you are already a syn oil user, my suggestion would be to do two or three 3K OCIs with either Pennzoil Platinum or Ultra (depending on availability and what your wallet can bear). These are two high detergent synthetics that will slowly and safely remove any build up.
For my (confirmed) sludged Toyota I use Platinum with 10% MMO (which was 12 ounces for my sump size). The small amount of MMO is a cheap, safe method of helping the Platinum along as I have some significant, thick deposits that I am dealing with.
In your case MMO is purely optional, and IMHO not necessary if you go the Pennzoil Platinum / Pennzoil Ultra route for a few short OCIs. If you decide to add it, I would work out a 10% concentration using your sump size and add it just for the last 1,000 miles. With a good detergent oil like Pennzoil Platinum or Pennzoil Ultra, MMO is strictly optional and you only need a small amount over a short interval to get the benefit of it. With the stubborn deposits I have, my use of MMO is to soften them up to help the PP remove over time. 10% is enough MMO to accomplish this.
I am not recommending MMO in your instance; only saying that if you decide to add it in, then this is the safest way to add it and all that you need to add.
-Spyder
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