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" What is ALPHAGAN® P 0.1%?
ALPHAGAN® P 0.1% ophthalmic solution is an eye medication that's approved for lowering high eye pressure (intraocular pressure or IOP) in patients with open-angle glaucoma or ocular hypertension."
Synthetic oil can be fine for all engines. If the engine is a high mileage engine and has a history of losing oil, then synthetic is not the best option if for no other reason than cost. As far as oil pressure drop, as long as oil levels are maintained, there should be no appreciable difference. If you need a special oil to increase oil pressure, then you have more important things to worry about - like finding a new engine or a good rebuilder, since the engine you are using is not long for this world.
As with any hot water or heating appliance, a hot water boiler system requires a constant pressure flow to maintain the optimum temperature. Hot water boiler systems are equipped with a pressure gauge and an automatic pressure reducing valve that will add water to the system if the pressure drops. Despite the pressure reducing valve, owners should be familiar with the standard PSI of their hot water boiler system and should check the pressure reading regularly. OBD Tools 365 Days Shop
Fuel pump relay is in cavity A in the rear SAM ( Signal Acquisition Module.) on the left hand side of the trunk behind a door.
When did you check the voltage..... you must read it while cranking or you will get a zero voltage reading.. The low pressure tank pump builds pressure to the high pressure pump and then shuts down until a pressure drop is sensed in the low pressure line and it then starts up again.
If rail pressure is too low, it often is the high pressure pump in the engine or the relief valve in the fuel rail. The tank pump is low pressure just to stop the tandem pump from cavitating by sucking too hard.
Mercedes can check the rail pressure and do an injector pressure drop to rule out a leaking injector.
If the tank pump is bad it will require replacement.
When a car is in gear with the Gas pedal pushed down, the engine RPM is high so the oil pressure is high too that means the Sending unit is detecting high pressure. But when you engage the clutch that means the gas pedal is released so the RPM drops and the pressure drops down too. So all i can say is that you might have a bad oil pump that needs always high RPM to keep the oil pressure normal.
When the engine and oil are cold it will show a high pressure because of the viscosity of the oil. When it warms up the oil is thinner. If it doesn't drop below 20-25 psi at warm idle I wouldn't worry about it as that is normal.
This is a little A/C 101. Follow the A/C lines. All A/C systems have a high pressure side and a low pressure side. The high pressure side is from the compressor to the condenser coil on the front of the vehicle to the evaporator coil in the dash. At the expansion valve in the evaporator the pressure drops. At the expansion valve the refrigerant changes from a liquid to a gas. This provides the cooling. The low pressure side is from the evaporator back to the compressor. Usually the high pressure lines are smaller than the low pressure (suction) lines.