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flotsam

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About flotsam

  • Rank
    Lexus Enthusiast

Profile Information

  • First Name
    Samantha
  • Lexus Model
    LS400
  • Year of Lexus
    1998
  • UK/Ireland Location
    Please Select
  1. I use Total Quartz Energy fully synthetic but mine's low mileage. Viscosity at 40°C and 100°C: Total Quartz Energy 0W-30: 68.45 12.18 Castrol Edge 5W-30: 73.4 11.9 So it's less viscous when cold but more viscous when hot. What's not to like! I've been using this fully-synthetic for a few years now and the engine runs super-smooth and quiet. And it's cheaper too. As my Lexus manual suggests I let the engine run for 10s on start-up to oil the overhead cams, this is ideal as it's the least viscous when cold of the oils I've compared.
  2. Hope this wasn't Inchcape Retail, Farnborough on Elles Road. They're worse than Lexus Hull. Not only are they cowboys, they're crooked cowboys. The botch job they did to my car has had to have endless repairs to the botched repairs they did, including things they shouldn't have been touching whatsoever. Complete low life.
  3. According ot the tests, my LS400 mkIV is 67.5dB at 60mph. In other words, it's all tyre noise.
  4. Here's my mpg in mkIV LS400 passing the same point on cruise control, which has a VERY slight incline (as I didn't want a coasting mpg), almost flat. Notice how Lexus has set it up for 56mph: mph mpg 40 42 50 42.7 55 44.4 56 47.2 57 42.9 59 41.1 60 39.7
  5. Super unleaded is WELL WORTH the extra expense. As I've posted many times before on these fora (but which have been subsequently deleted), the octane rating is how much you can compress the fuel before "pinking" or "knocking" occurs. High compression engines are supposed to be more efficient like a diesel engine which typically has compression ratios of about 16:1. An engine with compression ratio of up to 10:1 doesn't need super unleaded. But higher than that and you do. Modern engines have anti-knock sensors which retard the timing to compensate for too low an octane fuel. A high compressi
  6. RON ratings. The final test of petrol is done using a special standard single cylinder engine to find the "knock" coefficient. With the best equipment available, it is only just possible to measure RON to within about +/-1.5. So the actual figures at the pumps for petrol rated as 95 RON could be 93.5 to 96.5 & for 97 RON 95.5 to 98.5. But these small amounts really make almost no difference to anything. This does not mean that different petrols with different additives will not behave in different ways. RON has nothing at all to do with the "Power" in the petrol, just in the way it burns.
  7. Suprised! I've tried Momentum and the engine (compression ratio 10.5:1) though smooth feels underpowered. Sainsbury's super unleaded (which was 97RON last I looked) feels much livelier. Ethanol has a RON of 102 meaning you can compress it that much more before it self ignites (known as "knocking" or "pinking") and it has less energy; it expands less when ignited. Perhaps the Sainsbury's petrol I've been using has next to no ethanol!!!
  8. I used to dribble water on the car so that you get a sheet of water which runs of as one big mass. But there's a better way, Do NOT use a chamois for drying the paintwork. Save that for the glasswork only. Instead, get a damp cloth impregnated with car wax and use that to displace the water as well as apply the thinnest of films of car wax. It's quicker and you get a glossier shine, without streaks.
  9. The RON is a measure of how much you can compress the fuel before it self-ignites; before the spark plugs spark! This is how diesel engines work, which have a higher compression ratio of typically 16:1 and why they're stronger engines. Petrol engines can get the same effect. It's called "knocking" or "pinking" and will, in time, shake your engine to bits. Anti knock sensors roll back the timing, meaning they ignite the fuel earlier (I believe). But this means you're compressing an expanding fuel. Petrol cars with a compression ratio of up to 10:1 are OK with standard 95 RON unleaded. But my
  10. Yeah, as I said, it retards the timing so that your car CAN run on 95 but it runs far better on higher octane if it's a higher compression engine.
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