I think the Redline regimen is even more important nowadays, as the level of detergent in gasoline has fallen by about half.Īs far as carbon build-up, it's a good idea to drive at 4000 rpm for a mile or so and "let the engine breathe" on a regular basis - so says the 535i Owners Manual. I would recommend that you do this in conjunction with a BMW-approved Top Tier gasoline (do a search).
I've used it ever since I put the new injectors in, as a prophylactic, and it seems to work just fine, using the measure on the bottle and adding it as I fill up. While it is true that many FI cleaners can dilute oil (because they are solvent based, as in BG 44K) Redline doesn't. Redline SI-1 is not a solvent based fuel system cleaner, it's a detergent, and Redline actually recommends it with every fill up. And stop wasting money on premium and fuel system additives every tank! I am also assuming, for the purposes of this conversation, that the car is in a sound basic state of tune and is up to date on maintenance. If the pinging continues, you should have the car professionally checked because there could be something else going on. Add the ventil sauber, and drive at sustained high RPM. Same rule thought - change the oil shortly thereafter. If you do want to add any more additives to the tank, you might also try a can of Ventil Sauber from Lubro Moly. Before wasting any more money on premium fuel or fuel system cleaner, I would take a long road trip and put the car in 3, not D, to get the revs up into the 3,000 - 4,000 rpm period for a sustained period of time. Accordingly, I would suspect that your issue is that you have excessive carbon buildup on the valves. It is very common for automatic transmission cars not to see sustained high rpm operation, and given that the M30s are already prone to carbon build-up, this only exacerbates the problem. Your car, at 8.8:1, will run fine on 89, and should be OK on 87. The compression threshold, roughly speaking, for high octane fuel is about 10:1. More is just wasted money.Īs far as the octane rating goes, the M30B32 engine does not require premium grade fuel. Using a good fuel system a few times a year should be sufficient to keep your system in good shape. I believe the reason for this, in layman's terms, is that the fuel system cleaner will essentially degrade the oil's ability to lubricate, and discharge contaminants (cleaned from the fuel system) into the engine oil. Moreover, when you use a fuel system cleaner (I typically use BG 44K), you should only use it shortly before you change your oil. Second, you do not need to use this stuff every fillup, because it is overkill. dose at every fill-up as advised by this BMW CCA journalist.Īnyone else use this product? Anyone have issues with pinging/knocking on hills at full-throttle at mid-rpm? Surely this is more common with autos.įirst off, it is probably a typo, but you couldn't be using 10 gallon at every fill-up, right? You probably mean the amoun to treat 10 gallons, right? (I'm sure if I drove the hell out of it all the time, it would be less). It has been less after using Redline SI-1, but it is still there. When on a hill, between 2,500-3,500 I occasionally hear knocking/pinging. I have always used premium fuel (93+ oct) - bare in mind the compression is 8.8:1 (near the threshold for requiring premium). My car is an automatic, and rarely see's more than 3,000 rpm in normal driving. CT533i wrote:Anyone use Redline SI-1 Fuel cleaner on a regular basis? I've been using it for about 2 years as recommended by a BMW CCA journalist.
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