Essex Rotary Enhanced Oil Pressure Regulator for 04-08 RX-8

Rated 5.00 out of 5 based on 2 customer ratings
(2 customer reviews)

£79.99 (inc VAT)

One of the most important upgrades in our opinion, in order to help prevent premature bearing wear in your RENESIS engine.

Suitable for 2004-2008 RX-8’s Only

As the later R3 does not have a rear Oil Pressure Regulator.

8 in stock (can be backordered)

Purchase this product now and earn 80 ER Points!


The new oil pressure regulator from Essex Rotary is based on a modified Mazda regulator but is designed to run a higher maximum oil pressure. Bringing the standard pressure on a series 1 RX-8 from  from a maximum of 80 psi and increasing it to around 110psi this increased oil pressure means that your series 1 engine will now run pressures much closer to that of the later series 2 RX-8 (R3)


This makes the Essex Rotary enhanced oil pressure regulator great for ported ad high revving applications, equally suited in a standard engine its a great upgrade for piece of mind.

The main advantage of the increased oil pressure would be to increase bearing protection over that of the standard 80psi found in the series 1.

In our experience we have removed many oil pressure regulators from engines that have been running a maximum bypass pressure as low as 50-55 psi, This is around a 30-40% Loss in Oil Pressure across the rev range. Oil pressure this low is a serious contributing factor in bearing failure within the Rotary engine. Especially the RENEIS engine built for the RX-8

Additional information


Please Note The 2009-2011 RX-8 Renesis engine is not equipped with a rear pressure regulator. Normal oil maximum oil pressure on this application is 110-115 PSI. We do not offer a regulator to increase the oil pressure on this application.

ER Oil Regulator Spec

Bypass Pressure 100-110PSI

2 reviews for Essex Rotary Enhanced Oil Pressure Regulator for 04-08 RX-8

  1. Rated 5 out of 5

    soishiro.factory (verified owner)

    Replacing my original regulator by the ER enhanced piece.
    This one is able to set an increased of 30% of the oil pressure. I highly recommand this regulator for better lubrification and Rotary engine life.

  2. Rated 5 out of 5

    paul.lowery (verified owner)

    Bought this upgrade while replacing my rusted sump, the increased oil pressure will give the engines bearings better protection as Mazda did later in the R3 engine.

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